This pressure switch is designed for use in ventilation and air conditioning systems to monitor and control airflow in ducts, filters, dampers, and fans. It is suitable for air and other non-flammable, non-aggressive gases. The switch detects small pressure changes and is commonly used for aerator flow control, fan and HVAC system monitoring, overheating protection, and frost protection in industrial refrigeration systems. Its design allows visual adjustment of the set point. Pressure connection: 6.2 mm internal thread tube or G1/8 (optional if hole is present) Electrical connection: screw terminals; AMP 6.3 mm and AMP 4.8 mm connectors Operating temperature range: -30°C to +85°C (maximum overpressure: 5000 Pa) Installation: quick and easy, suitable for both vertical and horizontal mounting Adjustment accuracy: extremely high Service life: stable operation with over 1,000,000 switching cycles Medium compatibility: air and non-corrosive gases Pressure range: 20–200 Pa Accuracy: repeatability < ±1% of full scale Color: gray Material: plastic Dimensions: 81 × 53 mm Package contents: 1 × differential pressure switch Note: Color appearance may vary slightly due to lighting and screen settings. Dimensional tolerance: ±1–3 cm.